Crystalline form of AHU377, preparation method and use thereof

The present disclosure relates to the field of pharmaceutical chemistry, particularly relates to crystalline form of AHU377, preparation method and use thereof.

The chemical name of AHU377 is (2R,4S)-5-(Biphenyl-4-yl)-4-[(3-carboxypropionyl)amino]-2-methylpentanoic acid ethyl ester, and the structure is shown as Formula (I):

U.S. Pat. No. 5,354,892A firstly discloses the structure of AHU377, its sodium and the preparation method thereof, but the patent does not disclose crystalline forms of AHU377.

CN102702119A discloses a dual-acting compound LZ696, the structure is shown as Formula (II). The compound takes AHU377 and Valsartan as active ingredients, and the two active ingredients are connected through hydrogen bonds. The patent also discloses a method for preparing LCZ696 by using AHU377 or its salts. LCZ696 is clinically proven to be used for treating various cardiovascular and/or kidney diseases, and LCZ696 was approved in United States in 2015 as trade name “ENTRESTO”.

The inventor summarized the prior art, and discovered that AHU377 was in the form of sticky oil at room temperature. Using AHU377 sticky oil as the starting material is hard to transfer and precisely quantify in the industrial production of LCZ696. According to the prior art, in order to overcome the problem of transfer and precise quantification, AHU377 has to be prepared into a solid salt, but the salt still needs to be broken into AHU377 free acid in the preparation of LCZ696 afterwards. The existing process is not only cumbersome, but also introduces a large number of impurity ions, which are bad for quality control in process.

Based on the problems of prior art, it is of great importance to find a solid form of AHU377, which is suitable for transferring, quantifying and avoiding introducing impurity ions and simplifying the process in the industrial production of LCZ696.

The technical problem to be solved in the present disclosure is to provide a solid form of AHU377.

In order to solve the above-mentioned technical problems, the present disclosure uses the following technical solution:

A compound of formula (I),

The compound of Formula (I) is in a solid form.

In particular, the compound of Formula (I) is in a cystalline form.

In particular, the compound of Formula (I) is an anhydrate, a hydrate or a solvate.

The solid form in the present disclosure is an anhydrate, designated as crystalline Form I. The crystalline form in the present disclosure has good stability and low hygroscopicity and is suitable for industrial production.

In particular, said solid form is crystalline Form I, and the X-ray powder diffraction pattern of Form I shows characteristic peaks at 2theta values of 17.2±0.2°, 16.4±0.2° and 9.8±0.2°.

Preferably, the X-ray powder diffraction pattern of crystalline Form I shows characteristic peaks at 2theta values of 12.3°±0.2°, 8.2°±0.2° and 4.1°±0.2°.

More preferably, the X-ray powder diffraction pattern of crystalline Form I shows characteristic peaks at 2theta values of 13.0°±0.2°, 18.4°±0.2°, 13.8°±0.2° and 6.1±0.2°.

In particular, the X-ray powder diffraction pattern of crystalline Form I shows characteristic peaks at 2theta values of 17.2±0.2°, 16.4±0.2°, 9.8±0.2°, 12.3°±0.2°, 8.2°±0.2°, 4.1°±0.2°, 13.0°±0.2°, 18.4°±0.2°, 13.8°±0.2° and 6.1±0.2°.

The X-ray powder diffraction pattern of the crystalline Form I of the present disclosure is substantially as depicted in FIG. 1 .

The differential scanning calorimetry (DSC) thermogram of crystalline Form I shows an endothermic peak when heated to around 72° C. (onset temperature), which is substantially as depicted in FIG. 2 .

The thermal gravimetric analysis (TGA) thermogram of crystalline Form I of the present disclosure shows about 0.9% weight loss when heated to 140° C., which is substantially as depicted in FIG. 3 .

The present disclosure further provides a process for preparing solid form of Formula (I), the solid form of Formula (I) is precipitated by crystallization of the sticky oil of Formula (I) in a mixture of one or more organic solvents of alcohols, ethers, ketones, aromatic hydrocarbons, with one or two solvents of alkanes, water.

Preferably, said mixture is a mixture of toluene and n-heptane.

More preferably, the sticky oil of Formula (I) is firstly dissolved in toluene, then n-heptane is added, and solid form of Formula (I) is precipitated by crystallization.

More preferably, the content of sticky oil in toluene is 0.1 to 0.2 g/mL.

Preferably, the crystallization methods comprise the steps of anti-solvent addition, evaporation, stirring or cooling.

The present disclosure further provides use of the solid form of Formula (I) for preparing a drug for treating heart failure.

The disclosure further provides a drug for treating heart failure, wherein active ingredient of the drug is a complex which comprising valsartan and the solid form of Formula (I).

The present disclosure also provides a process for preparing a drug for treating heart failure, comprising reacting the solid form of Formula I, Valsartan and the alkaline containing sodium ions in ketone solvents or a mixture of ketone solvents and water to obtain the drug for treating heart failure.

Preferably, the mass ratio of the solid form of Formula (I) and Valsartan is from 1.1:1 to 1:1.1.

Preferably, said alkaline containing sodium ion comprises sodium hydroxide.

Preferably, said ketone solvent comprises acetone.

Furthermore, the water content of the reaction system is no more than 6%.

The present disclosure has the following advantages:

AHU377 prepared according to the prior art is sticky oil and no crystalline form of AHU377 is seen in patent or literature. The inventors studied and discovered a crystalline form suitable for development. The AHU377 crystalline form prepared in the present disclosure has good stability, low hygroscopicity, strong impurity removing capacity, remarkable effect of purification, and strong economic value.

The AHU377 crystalline form prepared by the present disclosure can be used for the preparation of LCZ696, a drug for treating heart failure. It overcomes the difficulties that using AHU377 sticky oil as the starting material in the prior art is hard to transfer and precisely quantify. It also simplifies the preparation method, and avoids introducing impurity ions, which is of great significance to the industrial production and quality control of LCZ696.

FIG. 1 shows the XRPD pattern of AHU377 crystalline Form I prepared in Example 1.

FIG. 2 shows the DSC thermogram of AHU377 crystalline Form I prepared in Example 1.

FIG. 3 shows the TGA thermogram of AHU377 crystalline Form I prepared in Example 1.

FIG. 4 shows the DVS plot of AHU377 crystalline Form I prepared in Example 1.

FIG. 5 shows the PLM image of AHU377 crystalline Form I prepared in Example 1.

FIG. 6 shows contrast figure of the morphology of crystalline Form I and the sticky oil of AHU377, the left side of the picture shows crystalline Form I of AHU377 as a white powder, the right side of the picture shows sticky oil of AHU377, which is pale yellow and like sticky honey.

FIG. 7 shows an XRPD pattern of LCZ696 prepared in Example 6.

The present disclosure will be further explained by the specific embodiments, but are not intended to limit the scope of the present disclosure. The skilled in the art can make improvements to the process of preparation and the used instruments within the scope of the claims, and those improvements should be considered as falling into the scope of the present disclosure. Therefore, the protective scope of the present disclosure patent should be defined by the claims.

In the following examples, the test methods are generally carried out in accordance with conventional conditions or conditions recommended by the manufacturer. The starting material of AHU377 is a sticky oil prepared according to the prior art, for example U.S. Pat. No. 5,354,892A, and the remaining raw materials are commercially available.

The abbreviations used in the disclosure are explained as follows:

XRPD: X-ray Powder Diffraction

DSC: Differential Scanning calorimetry

TGA: Thermal Gravimetric Analysis

DVS: Dynamic Vapor Sorption

PLM: Polarized Light Microscope

X-ray powder diffraction pattern in the present disclosure was acquired by Panalytical Empyrean X-ray powder diffraction, and the detection temperature was room temperature (about 25° C.). The parameters of the X-ray powder diffraction method of the present disclosure were as follows:

X-ray reflection parameters: CuKa

Kα1 (Å): 1.540598; Kα2 (Å): 1.544426

Kα2/Kα1 intensity ratio: 0.50

Voltage: 45 (kV)

Current: 40 (mA)

Divergence slit: automatic Scan mode: Continuous

Scan range: from 3.0° to 40.0°

Differential scanning calorimetry (DSC) thermogram in the present disclosure was acquired by a TAQ2000. The parameters of the differential scanning calorimetry method of the present disclosure were as follow:

The scan rate: 10° C./min

Purge gas: nitrogen

Thermal gravimetric analysis (TGA) thermogram in the present disclosure was acquired by a TAQ5000. The parameters of the thermal gravimetric analysis (TGA) method of the present disclosure were as follow:

The scan rate: 10° C./min

Purge gas: nitrogen

Dynamic Vapor Sorption (DVS) was measured via a SMS (Surface Measurement Systems) DVS Intrinsic. Typical Parameters for DVS test are listed below.

Temperature: 25° C.

Gas and flow rate: N 2 , 200 mL/min

dm/dt: 0.002%/min

RH range: 0% RH to 95% RH